JPS623680Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a scrap preheating device for preheating scrap using electric furnace exhaust gas.

It is known that if the scrap to be fed into the electric furnace for steelmaking is preheated using the electric furnace exhaust gas, it will have a significant effect on energy savings during smelting, and a scrap preheating device for this purpose is Various types have been developed.

In conventional scrap preheating equipment, a pit-shaped scrap preheating chamber is generally installed underground near an electric furnace factory, and scraps transported from a scrapyard by truck or the like are charged into a basket stored in this scrap preheating chamber. Alternatively, the basket is transported to a scrap yard, loaded with scrap, and stored in a scrap preheating chamber, and electric furnace exhaust gas is blown into the basket to preheat the scrap.

However, with such conventional equipment, several trucks are required to transport and load the scraps from the scrapyard into the baskets stored in the scrap preheating chamber, or transport the baskets to the scrapyard and into the scrap preheating chamber. There were problems such as it took a lot of time and effort to store the underground pit, and a large amount of money was required to construct the underground pit.

Based on the above-mentioned viewpoints, this idea was developed to provide a scrap container that can efficiently charge scrap into a basket, eliminates the expense of constructing an underground pit, and can preheat scrap with high efficiency. This device provides a preheating device, which has an open top, a series of water seal grooves on the outer periphery of the upper part of the side wall, and an exhaust gas outlet in the lower part of the side wall to accommodate the basket into which scraps are charged. A movable preheating chamber that is mounted on a trolley and can freely travel between the scrap preheating position and the scrap yard, and a frame car that is movable in the left and right direction across the opening in the second floor provided at the scrap preheating position. The present invention is characterized in that it comprises a lid body with a hood for blowing in exhaust gas from the electric furnace, which is supported in a manner that can be raised and lowered, and is capable of freely attaching a water seal to the opening surface of the movable preheating chamber.

Next, the apparatus of this invention will be explained by way of examples with reference to the drawings.

FIG. 1 shows a plan view of an embodiment of the device of this invention. As shown in the drawing, the scrap preheating position A is located near the electric furnace factory, away from the scrapyard B, and a rail 2 is laid between the scrap preheating position A and the scrapyard B.

In this embodiment, the rail 2 is a parallel double track 2A, 2B on the scrap preheating position A side, and a single track on the scrapyard B side.
The capacity of the electric furnace, such as making the whole double track or double track,
It may be freely determined based on the number etc. 26 is a switch provided on the rail 2.

Between the scrap yard B and the scrap preheating position A, there is a movable preheating chamber 3 that can freely run on the rails 2.
is located.

The movable preheating chamber 3 is mounted on a truck 4, as shown in the partially cutaway side view of FIG. 2, and a predetermined basket 5 can be stored in the preheating chamber.

The embodiment shown in FIG.
One movable preheating chamber 3 is located at scrap preheating position A to preheat scrap, and the other movable preheating chamber 3 is located at scrapyard B and is shown charging scrap. When the preheating work of the movable preheating chamber 3 at the preheating position A is completed, the basket 5 is taken out from the movable preheating chamber 3 using a crane or the like, moved to the electric furnace 1, and the scraps in the basket 5 are placed in the electric furnace 1. throw into. The empty basket 5, which has been loaded with scraps into the electric furnace 1, is again stored in the movable preheating chamber 3 and moved to the scrapyard B, where the scraps to be preheated are loaded into the basket 5.

At the scrap preheating position A, one lid 6 is provided which can freely attach a water seal to the opening surface of the movable preheating chamber 3.

FIG. 3 shows details of the movable preheating chamber 3 and the lid 6 in the scrap preheating position in an enlarged plan view. In FIGS. 2 and 3, the lid 6
The frame car 8 is movable in the left and right direction across the opening 7A of the second floor 7 provided at the scrap preheating position.
It is supported so that it can be raised and lowered freely.

Rails 9 on which a frame car 8 runs are laid on the second floor 7, and wheels 10 of the frame car 8 running on the rails 9 are driven by a reversible motor 11 provided on the frame car 8.

The wheels 10 have four wheels, but only two of the four wheels are driving wheels, and the other two wheels are free to spin.

The movable preheating chamber 3 is provided with a series of water seal grooves 12 on the upper outer periphery of its side wall 3A, and the lid body 6 has a downward edge 6A that can be freely fitted into the water seal groove 12.
is provided.

The lid body 6 whose edge portion 6A is fitted into the water seal groove 12 is supported by the frame wheel 8 via an elevating drive mechanism 13.

In this embodiment, the elevating drive mechanism 13 is composed of a rack 14, a pinion 15, a reversible motor (not shown) for driving the pinion, etc., as only one is shown in the enlarged vertical side view in FIG. However, as shown in the schematic front view in FIG. 5, the drive shaft 16 on the frame car 8 is driven by a reversible motor (not shown), and the drum 17 fixed to the drive shaft 16
It may be a mechanism for suspending the lid body 6 using suspension ropes 18 (total of 4) such as wires or chains wrapped around the frame car 8, or it may be a mechanism that can support the lid body 6 with respect to the frame car 8 so as to be able to move up and down. If so, it may be of any type, such as a hydraulic cylinder type or a screw cylinder type.

The lid body 6 is provided with a hood 19 for blowing exhaust gas from the electric furnace.
is installed in place. The electric furnace exhaust gas blowing hood 19 is configured such that its end 19A can be connected to either of the openings 20A and 20B of the exhaust gas blowing duct 20 opened to the second floor 7. When the hood 19 is connected to one of the openings 20A and 20B, the other is closed by the blind lid 21.

Further, an exhaust gas exhaust port 22 is provided at the lower part of the side wall 3A of the movable preheating chamber 3 (lower part of the front wall in this embodiment), and an exhaust gas exhaust duct 23 connected to the exhaust gas exhaust port 22 is provided with an exhaust gas exhaust duct 23 as shown in FIG. As shown, two openings 23A and 23B are provided, and this opening 2
When either one of 3A and 23B becomes vacant when the movable preheating chamber 3 is moved, it is replaced with the blind lid 24.
Close it with

To preheat the scrap, the lid body 6 is water-sealed on the opening surface of the movable preheating chamber 3, and the hood 1 is attached to the opening 20A or 20B of the exhaust gas blowing duct 20.
The blower 25 provided in the middle of the exhaust gas exhaust duct 23 is driven with the exhaust gas exhaust port 22 connected to the opening 23A or 23B of the exhaust gas exhaust duct 23.
By doing this, the electric furnace exhaust gas is sucked into the movable preheating chamber 3, and after preheating the scrap charged in the basket 5, it is passed through the exhaust gas outlet 2.
2, passes through the exhaust gas exhaust duct 23, passes through a dust removal device (not shown), and is discharged into the atmosphere.

In addition, it is desirable that the connection means of each duct employs a mechanism that allows easy connection and disconnection operations as much as possible, and in order to save labor, a mechanism that can be remotely operated may be used.

Next, the operation of the device of this invention will be explained. First, the movable preheating chamber 3 is moved to the scrapyard B, and the scraps are charged into the basket 5 stored in the chamber and at the same time, the scraps are weighed. To weigh the scrap, it is sufficient to weigh the entire cart at a weighing station provided in the scrapyard B, but it is convenient if the cart itself has a built-in weighing mechanism.

After loading a predetermined amount of scrap into the basket 5, the movable preheating chamber 3 is moved to the scrap preheating position A, and the movable preheating chamber 3 is moved to the scrap preheating position A, and the exhaust gas exhaust port 22 and the exhaust gas exhaust duct 2 are moved to the scrap preheating position A.
At the same time, the lid body 6 is water-sealed to its opening surface, and the hood 19 and the exhaust gas blowing duct 20 are connected, and then the blower 25 is driven to supply high-temperature electricity into the movable preheating chamber 3. Furnace exhaust gas is sent in to preheat the scrap charged in the basket 5.

When the preheating of the scrap is finished, the connection between the hood 19 and the exhaust gas blowing duct 20 is released,
After lifting the lid 6, the frame car 8 is moved laterally to open the movable preheating chamber 3.

From inside the open movable preheating chamber 3, the overhead crane
The basket 5 is hoisted by a hoist or the like, moved to the electric furnace 1, and the preheated scraps are thrown into the electric furnace 1.

In this embodiment, two movable preheating chambers 3, 3 are used, so when taking out preheated scraps from one of them, the other movable preheating chamber 3, in which the scraps have been charged into the basket 5, is removed. If the scrap is kept on standby at the scrap preheating position A, the lid 6 removed from the former can be moved to the side and simultaneously attached to the latter with a water seal, thus making it possible to proceed with the preheating work with high efficiency.

As is clear from the above explanation, according to the device of this invention, scraps are charged into the basket,
This preheating work can be carried out extremely efficiently, and by increasing the number of movable preheating chambers, preheated scrap can always be completely supplied to multiple electric furnaces, and factory equipment can also be used for rail laying. This brings about excellent effects, such as the ability to improve the use of conventional equipment by simply providing the required number of movable preheating chambers, lids, etc., without making large-scale modifications such as installing pits.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an embodiment of the device of this invention, Fig. 2 is an enlarged partially cutaway side view showing the movable preheating chamber, basket, lid, etc. in the scrap preheating position, and Fig. 3 is the same. FIG. 4 is an enlarged longitudinal sectional side view of the elevating drive mechanism, and FIG. 5 is a front view schematically showing another elevating drive mechanism. In the drawings, A...scrap preheating position, B...scrap yard, 1...electric furnace, 2, 2A, 2B...rail, 3...movable preheating chamber, 3A...side wall, 4...cart, 5... Basket, 6... Lid, 6A... Edge, 7... Second floor, 7A... Opening, 8...
Frame car, 9...Rail, 10...Wheel, 11...Reversible motor, 12...Water seal groove, 13...Elevating drive mechanism, 14...Rack, 15...Pinion, 16...
... Drive shaft, 17 ... Drum, 18 ... Suspension rope, 19
...Hood, 20...Exhaust gas blowing duct, 20
A, 20B...Opening, 21...Blind lid, 22
...Exhaust gas discharge port, 23...Exhaust gas discharge duct,
23A, 23B...opening, 24...blind lid,
25...Blower.

Claims (1)

[Scope of utility model registration request] The top is open, a series of water seal grooves are provided on the outer periphery of the upper part of the side wall, and an exhaust gas outlet is provided in the lower part of the side wall, and the basket into which the scraps are charged can be stored freely, and is mounted on a trolley. A movable preheating chamber that can freely travel between the scrap preheating position and the scrapyard, and a frame car that can move in the left and right direction across an opening in the second floor provided at the scrap preheating position so as to be freely raised and lowered. . A scrap preheating device comprising: a lid with a hood for blowing exhaust gas from an electric furnace, which can freely attach a water seal to the opening of the movable preheating chamber;